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Journal of Zhejiang University SCIENCE  Vol. No. P.

http://doi.org/10.1007/s42242-BDMJ-D-23-00372


Reduced graphene oxide-mediated electron-hole separation in titanium dioxide for boosting photocatalytic antibacterial activity of bone scaffold


Author(s):  Pei Feng, Haifeng Tian, Feng Yang, Shuping Peng, Hao Pan4, Cijun Shuai

Affiliation(s):  State Key Laboratory of Precision Manufacturing for Extreme Service Performance, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China; more

Corresponding email(s):   panhao@csu.edu.cn, shuai@csu.edu.cn

Key Words:  reduced graphene oxide, photocatalysis, reactive oxygen species, antibacterial properties, bone scaffold


Pei Feng, Haifeng Tian, Feng Yang, Shuping Peng, Hao Pan4,Cijun Shuai. Reduced graphene oxide-mediated electron-hole separation in titanium dioxide for boosting photocatalytic antibacterial activity of bone scaffold[J]. Journal of Zhejiang University Science , , (): .

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DOI - 10.1007/s42242-BDMJ-D-23-00372


Abstract: 
Fast electron-hole recombination in the photocatalysis process of titanium dioxide (TiO2) limits its application in preventing bacterial infection for bone defect repair. In this study, TiO2@reduced graphene oxide (rGO) composites were synthesized through a hydrothermal method, in which rGO with superior electrical conductivity promoted the separation of photoelectron-hole pairs of TiO2, thus improving the efficiency of photocatalytic production of reactive oxygen species (ROS). Subsequently, the TiO2@rGO composites were introduced into poly-l-lactic acid (PLLA) to prepare bone scaffold with photocatalytic antibacterial function via selective laser sintering. It showed that TiO2 grew on the surface of rGO and formed a covalent bond connection (Ti-O-C) with rGO. The electrochemical impedance of TiO2@rGO composites was decreased, and the transient photocurrent intensity was increased from 0.05 μA/cm2 to 0.5 μA/cm2 . The electron spin resonance resulted that the photocatalytic products of TiO2 were •OH and •O2 − , which were two kinds of ROS that could kill bacteria via destroying Preprint of Bio-Design and Manufacturing (unedited) the bacterial membrane structure in vitro antibacterial experiment. The antibacterial rates of PLLA/TiO2@rGO scaffold against E. coli and S. aureus were 60% and 71%, respectively. Additionally, the scaffold exhibited enhanced mechanical properties due to the addition of TiO2@rGO as reinforcement phase and good biocompatibility for cell activity and proliferation.

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